That ProClear will give you all the versatility you will want to have a pristine environment for your fish. I have noticed many people tend to stay away from the comments about eheim canister wet/dry filters. "If there was EVER a CHOICE" no question about it...go for the ProClear! It includes the pump, the skimmer, and the bio balls. The drawback to a wet/dry is monthly maintenance after the first 3-4mos of breaking it in.

The maintenance is a monthly thing where you dig out about a quarter of the bioballs and gently was them in saltwater. This helps keep the nitrifying bacteria under control. You might also need to siphon the bottom of the proclear of the physical matter that accumulates and change/clean the pads every 6 months.

The theory behing the live rock rubble is to dramatically increase the amount of "good" bacteria to keep down on the maintenance. Technically you can run your tank off of live rock and a protein skimmer. This setup is very effective! Reef tanks have run for years on this type of setup!

the key thing with bio-balls is to have a prefilter and keep the particle waste out of the balls. they will need little to no cleaning and will have as much good bacteria as rubble rock if not more with the added surface area provided with the balls. also instead of ruble rock try maybe lava rock or something with a lot of holes and added surface area.